Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c43f002989c98f…

MALICIOUS

PDF

117.5 KB Created: 2021-07-26 08:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f55e034b50155978ae8e2948633bddf SHA-1: 39fe94e63ddd627c4804da36a1da24c59585b34e SHA-256: 86c43f002989c98f5a2d0aa8d0da5b9c228702820cbd4af29891462515c1455e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://burragebrothers.org/demo/jolie/beta/userfiles/files/barisisivad.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/756f73fc7b249fcbe93d8cc51ab297b6/84383167301.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee740b851c---63027527155.pdf
    • http://transcash.com/ci/userfiles/files/pisiseb.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/14011367688.pdf
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdf
    • https://cometsecurity.in/admin/userfiles/file/43522518123.pdf
    • https://eliteplacementagency.com/uploads/files/xupigijumiweda.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/keribilimamim.pdf
    • http://bienbao.net/uploads/files/kuvefuwibukinanelezujuda.pdf
    • https://dm288.com/slicice/file/24277251003.pdf
    • https://mfdesign.hu/files/file/giriluripebeboxerixapi.pdf
    • http://duonglaohanoi.com/userfiles/file/jotujasazijelogizowalalik.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2j21fc6rutpqmmf2r51bjstoj3/14654346164.pdf
    • http://servis-hradec.cz/files/file/9254872413.pdf
    • https://soechi.id/userfiles/file/zinijipixupug.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/49839395052.pdf
    • http://heureka-cz.eu/files/ditulariladunekekaxi.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/45ae138297b56b12e3b77b80f809517f/dinedareduzixixidoziliw.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/49a146477aff73d6a831a28afd1b93c3/19401070280.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf93fedfb4---rodifove.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+play+guesstures
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ec9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC9 16792 bytes
font_01_sfnt_off000186db.bin
6cad282faa5953de637b90c54d6497e13caeb582e7f5c7cfd3cd21f864923e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186DB 17672 bytes
font_02_sfnt_off0001b4ec.bin
1541228d6b3f7ab7d3c14d787e52677087dd56787714569cf7498d6c6cd95c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4EC 10520 bytes

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